Electrical-wave-transmission system



Get; 16 1923. 1, 47,955

W. E. BOOTH ELECTRICAL WAVE TRANSMISSION SYSTEM Filed Nov. 22. 1919 To wZl whom it may concem:

Patented Oct. 16, 1923.

UNITED STATES PATENT OFFICE.

BOOTH, OF NEW YORK, N. Y., AS IGNOR TO WESTERN ELECTRIC COMPANY, INCORYORATED, OF NEW YORK, N. Y A CORPORATION OF NEW YORK.

ELECTRICAL-WAVE-TRANSMISSION SYSTEM.

-Be it known that I, WILFRED E. Boo'rn, a citizen of the United States, residing at New York, in the county of New York,

State of New York, have invented certain new and useful Improvements in Electrical- Wave-Transmission Systems, of which the following is a full, clear, concise, and exact description. 7

The invention relates to electricaltransmission systems, and has for an object to provide particularly simple and convenientforms of si aling systems, more especially radio signa in systems. v

A furthero ject is to provide a sending and a receiving system for radio communication in connection witha single antenna system, and .provided with means which enables a single element in the antenna toserve to receive energy from the transmltv tor for transmission and to apply received energy to the receiver circuit. Y

A further object is to provide switching systems for radio or other transmitting and receiving, systems so designed that upon placing condition, the transmlt-ting system is left in condition not to interfere therewith and vice versa.

A further object is to provide a signaling system with means for supplying direct,

currentto the microphone of a. transmitter apparatus. from the same electrical source hich is used for one or more other purposes in the system, thereby eliminating one source. which heretofore has usually been provided.

A cially desirable form of wireless system for two-way signaling having minimum weight,

, bulk and complexity of apparatus.

The essential arts of a system involving the features of this invention are diagraminatically illustrated in the accompanying drawings. All the switch contacts are shown in the transmitting position. The antenna circuit 1 comprises a suitable radiating system connected to the coil 2 through the blade or element 8, of a' gangswltch having six elements, namely, 8 8,, e 8,, s

ands The coil 2 is grounded through the capacity 3 thereby completing the antenna the receiving system in receiving general'object is to provide a commer-.

circuit, and oscillating vacuum tube 4, has its anode connected to the coil 2 through the conductor 5, its grid connected to the coil 2 through the stopping condenser 6 and the switch 8,, and the cathode connected to ground through the connection 7 of the cathode-heating clrcuit, shown in dotted lines, to the antenna round. A suitable vacuum tube 8 is in para lel with the tube 4 with respect to the space current source EP. and the speech frequency choke coil 10. The space current path for the direct current through the tube 4: includes the high fre-- quency choke coil 11, conductor 12, the antenna coil 2 and the conductor 5. The input circuit 13. of the tube 8 has coupled thereto a microphone circuit 14 which iucludes the microphone 15 and the filament lfi/of avacuum tube 17 located in the re- I ceiving system. A battery or other suitable source EF provides heating current for the filamentary cathodes of the vacuum tubes of both thereceiving and the transmitting systems. When receiving, however, the blade 8, is on its point B, thereby breakin the filament-heatmg circuit of the transmittin tubes.

During reception the gang switch is so thrown that each blade. or element, 8,, 8,, etc.

blade 8, to the coil 2, while the cathode of' the detector 20 is connected to ground through the heating circuit. The input circuit of the tube 20 thereby comprises a suitable portion of the coil 2. All the connections to coil 2 except that of capacity 3 are variable. The waves detected by the tube 20 are repeated by the amplifiers 17 and 22 in a manner well-known in the art, thereby reproducing the received si als in the telephone receiver 23 or any sultable indicating instrument. g

During transmission the cathode-heating circuit of the receiving tubes is energized. Since the microphone circuit 14: is shunted across a portion of the heating circuit which of the gang switch, the operator will be able cause side tone.

includes the cathode 16, the microphone circuit Will-be energized. The microphone circuit may be shunted across any desired portion' of the cathode-heating circuit, across which there is a suitable drop of potential' This portion may include the filament or filaments 16 of one or more tubes and a suitable resistance -29 in the heating circuit which is external to the tubes if necessary. The variation in. potential of filament 16 with respect to its associated anode which i is inducedby the reaction of the microphone circuit upon the heating circuit tends to Since the heating circuit of the transmitter tubes isin parallel with the heating circuit of thereceiver tubes, an adjusting resistance 24 is-provided while a choke coil 25 serves to prevent reaction of the heating circuits upon one another. Choke 25 also serves to attenuate fluctuations from source EF.

The blades of the gang switch function as followsz Blade 8, in transmitting position connects a part 26 of the microphone circuit across the input circuit of the detector 20. .The

. small resistance which will necessarily be v possessed by the conductor 26 will aid a cerception. This prevents the grid-plate capacity of the tube 4 from acting as a shunt on the coil 2. This also prevents the path including the ca aacity 6 and the leak path of the oscillator rom shunting the capacity 3 during reception. 1

The blade 8,, serves during transmission to close the anode-cathode circuits of the tubes 4: and 8 which it opens during reception.

The blade 8,, during transmission connects the antenna to the antenna coil 2 directly, while during reception it connects the antenna to the antenna coil through the tun ing condenser 18 and the blade 8,.

3y a single motion, that is, the throwing to change from transmitting to receiving. The transmitting Wave length may be varied independently of the receiving wave length, and the constants of the antenna 'circuit ma'y be adjusted in the two cases to such values as maybe most desirable at thatinstant for the particular operation being carried on. A master switch 27 may be thrown 'to control the entire system, Although this master switch does not open the circuit of the source 28, *this is unnecessary because when the cathodes of the tubes 20, .16 and 22 are not energized, the source 28 cannot deliver any current. 1

The novel features believed to be inherent in the invention are defined in the, appended claims.

What is claimed is:

1. In a radio system, an antenna circuit for radiation and reception, a source of high frequency signaling oscillations, a receiv ng apparatus for translating received oscillatlons, an impedance element in the antenna circuit, and a switch device for operatively connecting said source and sald receiving apparatus alternately to said impedance device.

2. In a radio system, an antenna for radiation and reception, a source ,of high frequency signaling oscillations, a receiving apparatus for translating received oscillations, an impedance element in the antenna circuit,

a switch having one position for connecting said source to said element and another position for connecting sald receiving apparatus to said element, and devices for giving said antenna any predetermined one of a plurality of different natural periods in each of said positions irrespective of the natural period thereof in the other position.

3. A wireless transmission system comprising a thermionic oscillation generator,

an antenna circuit, means for connecting said antenna circuit thereto whereby said circuit primarily determines the frequency of the oscillations generated and radiates said oscillations, a receiving circuit, and common means to alternately vcouple said generator and said receiving circuit to said antenna.

4. A signaling system comprising a coil having points of connection adapted to be connected to a'transmission and reception conductor, means functioning in cooperation with said coil for generating signaling Waves, and means for translating received signaling waves, combined with means for alternatively connecting one or the other of said means to said coil and means whereby the circuits of the disconnected generating or translating means are rendered incapable of absorbing substantial amounts of energy from the connected means.

.5. An antenna circuit, a coil includedtherein, a wave generating means, translating means forreceivedwaves-cnieans. -for al-,-

,. translating means to said coil, and means for independently establishin 'the-.tuning of? said circuit in each of sal tions. I

6, A radio system comprising transmitting means and a power suppli therefor, an antenna coil and a gang switc ,a an element of said switch when in a receivin position cutting off said power supply rom said transmission devices, and another element thereof functioning to cut said devices from said antennacoil.

7. A system in accordance with claim 6 having a microphone circuit and a third element of said switch functionin to open said microphone circuit in receiving position.

8; A system according to claim 6 including a detector and another element of said switch functioning to connect said detector to said antenna coil in receiving position.

9. A signaling system comprising a trans mission circuit, said transmission circuit comprising a si naling circuit including a device for pro ucing electrical waves of signaling frequency, a receiving circuit comprising elements other than said transmission circuit and including an electron discharge device having a cathode, and a heat ing circuit for said cathode, said signalin circuit being shunted around a portion 0 said heating circuit.

10. A signalin system comprising a coil having points 0 connection adapted to be connected to a transmission and reception conductor, a receiving circuit. adapted to be coupled 0t said coil, a transmittin circuit connected posii adapted to be coupled to said coi and asingle control element for couplin the receiving circuit to and uncoupling t e transmitting circuit from said coil.

.11. A radio circuit including transmitting -means comprising ,a microphone, and a receiving circuit, comprising elements other than said transmission circuit and comprising a discharge device having a cathode, said mlcrophone being connected across a part of said circuit including said cathode.

12. A radio system having a switch, a microphone circuit, a detector and an antenna circuit, said switch in one position connecting said detector to said antenna circuit and in another position connecting a part of said microphone circuit to said detector.

13. A radio system including a microphone circuit, a detector, an antenna circuit and a switch, said switch being adapted in one position to close said microphone circuit and in another to shunt an element of said antenna circuit.

14. A radio system COIIIPIlSlHg a radiating conductor and-a-Fgang switch havin ali-plm rality ofR-positions,{acblade on;.-'sai switch adapted in one-of'said positionsitoe'connect said radiatingmember to 'groundf-through one path an in:.' another 10.-connects: sa1d radiating member to ground through an;

'70 OthQI. path-,..said paths having-onejmpedance means 1n common thereto, said impedance means servlng as an element for coupling a transmitting circuit to said conductor'in one position of said switch and for coupling a receiving circuit to said conductor in another osition of said switch. 15. n a signaling system, a cathode heat ing circuit grounded at one point, a series of cathodes included in and adapted to be heated by a source of energy connected to a said circuit, and a sound controlled variable impedance device connected across one of the cathodes of said circuit and adapted to receive energizing current by virtue of such connection.

16. In a radio transmission and reception 7 in said antenna circuit between sa1d coil and ground durin transmission, and means operated by t e movement of said switch to receivin position for closing afshunt path around sai capacity. 4

17. In a radio telephone transmission and reception circuit, a receiver circuit and a transmitter circuit having their hi h frequency circuit elements operative y disconnectedfrom each other at all times, a transmitting microphone, a receiving telephone, and a low frequency connection from said microphone to said telephone through said receiver circuit.

18. A signaling system comprising transmittin devices and separate receivin electron lscharge devices, cathodes an cathode-heating circuits for said devices and a voice current circuit including a evice for translating sound waves into electrical waves, said circuit bein in shunt to a part of one of said cathodeeating circuits.

19. A signaling system comprising trans mission means including a sound wave controlled device for producing electrical varia- Ill tions, a receiving means separate from the in the antenna for transmission and. recs tion, a transmitter circuit, a set of adjustab e connections for connecting said transmitter eg mmeee circuit to soda coil, a receiver circuit, a, set disturbing any ofseid sets of adjustable conof connections adjustable independently'of nections.

connecting said receiver circuit to said coil, my name. this 21st da said first mentioned set of connections for In witness whereof, I hereunto subscribe 1 y of November, A. D. and means for changing from transmitting 1919.

Positionto receiving position or receiving position to transmitting position Without WILFRED E. BQUTH, 

